• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Nanofluid pendant droplet evaporation: Experiments and modeling
【24h】

Nanofluid pendant droplet evaporation: Experiments and modeling

机译：纳米流体悬垂液滴蒸发：实验和建模

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Nanofluids, stable colloidal suspensions of nanoparticles in a base fluid, have potential applications in the heat transfer, combustion and propulsion, manufacturing, and medical fields. Experiments were conducted to determine the evaporation rate of room temperature, millimeter-sized pendant droplets of ethanol laden with varying amounts (0-3% by weight) of 40-60 nm aluminum nanoparticles (nAl). Time-resolved high-resolution droplet images were collected for the determination of early-time evaporation rate (D~2/D_0~2 ＞ 0.75), shown to exhibit D-square law behavior, and surface tension. Results show an asymptotic decrease in droplet evaporation rate with increasing nAl loading. The evaporation rate decreases by approximately 15% at around 1-3% nAl loading relative to the evaporation rate of pure ethanol. Surface tension was observed to be unaffected by nAl loading up to 3% by weight. A model was developed to describe the evaporation of the nanofluid pendant droplets based on D-square law analysis for the gas domain and a description of the reduction in liquid fraction available for evaporation due to nanoparticle agglomerate packing near the evaporating droplet surface. Model predictions are in relatively good agreement with experiment, within a few percent of measured nanofluid evaporation rate.
机译：纳米流体是纳米粒子在基础流体中的稳定胶体悬浮液，在传热，燃烧和推进，制造和医疗领域具有潜在的应用。进行实验以确定室温下的蒸发速率，其中载有变化量（0-3％重量）的40-60 nm铝纳米颗粒（nAl）的乙醇大小为毫米的悬垂液滴。收集时间分辨的高分辨率液滴图像以确定早期蒸发速率（D〜2 / D_0〜2＞ 0.75），显示出D平方律行为和表面张力。结果表明，随着nAl含量的增加，液滴的蒸发速率逐渐减小。相对于纯乙醇的蒸发速率，在1-3％的nAl负载下，蒸发速率降低了约15％。观察到表面张力不受高达3重量％的nAl负载的影响。基于对气体域的D平方定律分析，开发了一个模型来描述纳米流体悬垂液滴的蒸发，并描述了由于蒸发液滴表面附近的纳米颗粒团聚堆积而可蒸发的液体馏分的减少。在测得的纳米流体蒸发速率的百分之几以内，模型预测与实验相对较好。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号